MR. JUSTICE BROWN, after stating the case as above reported, delivered the opinion of the court.
In order to obtain a complete understanding of the scope of the Sawyer and Man patent, it is desirable to consider briefly the state of the art at the time the application was originally made, which was in January, 1880.
Two general forms of electric illumination had for many years been the subject of experiments more or less successful, one of which was known...
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